JP3982033B2 - Electric vacuum cleaner - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vacuum cleaner designed to reduce noise.
[0002]
[Prior art]
The structure of the conventional vacuum cleaner will be described with reference to FIGS.
[0003]
Reference numeral 2 denotes a main body of the vacuum cleaner 1, which is used by connecting the hose 3, the extension pipe 4, and the floor nozzle 5 as shown in FIG. Inside the main body 2, a dust collection bag 6 for collecting dust sucked forward is incorporated, and an electric blower 7 and a cord winding device 8 are incorporated in the rear.
[0004]
The outer periphery of the electric blower 7 is almost entirely covered with a rubber-based and flexible motor cover 9. A slit 10 is provided in a part of the bottom surface of the motor cover 9, and the A portion 11 defined by the slit 10 is easily deformed to be opened. A control switch 13 for switching the operation state of the electric blower 7 is disposed on the handle 12 of the hose 3.
[0005]
During use of the vacuum cleaner 1, particularly when the electric blower 7 is operating strongly, the intake air sucked into the main body 2 through the floor nozzle 5, the extension pipe 4 and the hose 3 As shown by the arrows in FIG. 8, from the gap between the circumference and the electric blower 7, the exhaust air speed and the exhaust air volume of the electric blower 7 are maximized so that they exit from two locations from the A portion 11 that opens greatly in a hinge shape. Then, the gas is discharged from the exhaust port 15 to the outside of the main body 2 through the exhaust passage 14. Since the exhaust passage area at this time is sufficient, the maximum suction force is exhibited.
[0006]
On the other hand, when the electric blower 7 is operated weakly, the exhaust air speed and the exhaust air flow are reduced compared to those during the strong operation, the A portion 11 is almost closed, and the exhaust from the electric blower 7 is exhausted all around the front end of the motor cover 9. As a result, the exhaust discharged from the electric blower 7 returns to the front end of the motor cover 9 and then is discharged from the exhaust port 15 through the exhaust passage 14, particularly high-frequency noise. Will be attenuated on the way and become a quiet driving sound.
[0007]
[Problems to be solved by the invention]
However, in the configuration of the conventional vacuum cleaner 1, in order to attenuate the high frequency during the weak operation, the motor cover 9 that is mounted so as to wrap the electric blower 7 must be used, and the manufacturing unit price inevitably increases. Resulting in.
[0008]
In addition, a sufficient exhaust passage area is required to prevent loss of suction force even during weak operation, and for this purpose, a predetermined gap must be provided between the outer periphery of the electric blower 7 and the inner wall of the motor cover 9, Around the motor cover 9 and other housing parts in the main body 2, for example, circuit parts (not shown) for electrically controlling the operating state of the electric blower 7, the cord winding device 8, and the motor cover 9 and the main body 2 A predetermined gap has to be secured between the inner surface and the main body 2 is enlarged as a result.
[0009]
The present invention is intended to solve the conventional problems as described above, and an object of the present invention is to provide a vacuum cleaner that realizes a reduction in high-frequency sound particularly during weak operation with an inexpensive configuration.
[0010]
[Means for Solving the Problems]
To achieve the above object, the present invention provides an electric blower for sucking dust, a main body having an electric blower chamber containing the electric blower, an exhaust port provided on a rear surface of the main body, and the electric blower. An exhaust passage that guides exhaust from the chamber to an exhaust port, and a wall that partitions the electric blower chamber and the exhaust passage, and the wall opens at a position where the upper portion faces the exhaust port and the lower portion does not face the exhaust port. The opening is covered with a shielding plate made of a flexible material, and the lower end of the shielding plate that is not fixed is moved by the exhaust from the electric blower. The exhaust passage area can be secured according to the conditions, and during the strong operation of the electric blower, a part of the shielding plate that shields the exhaust passage is bent and deformed to secure the necessary exhaust passage area, while the weak operation Sometimes exhaust wind speed decreases Correspondingly, largely shielded from the strong driving an exhaust passage, and one in which it is quieter and preventing the particular high frequency sound by diverting the exhaust gas is discharged directly from the exhaust port.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
The invention of claim 1, wherein the present invention is an electric blower for sucking dust, a main body having an electric blower chamber with a built-in said electric blower and an exhaust port provided on a rear surface of the body, the electric blower An exhaust passage that guides exhaust from the chamber to an exhaust port, and a wall that partitions the electric blower chamber and the exhaust passage, and the wall opens at a position where the upper portion faces the exhaust port and the lower portion does not face the exhaust port. the section is provided, the whole or part of the opening covered with the shielding plate made of flexible material, that the lower end portion that is not fixed in the shield plate by the exhaust from the electric blower is moved, the exhaust The exhaust passage area according to the air volume can be secured, and when the electric blower is operated strongly, a part of the shielding plate that shields the exhaust passage is bent and deformed to secure the necessary exhaust passage area. Responds to a decrease in exhaust wind speed during operation Te greatly shielded from the strong driving an exhaust passage, and it is quieter especially high frequency sound by diverting exhaust is prevented from being discharged directly from the exhaust port. In particular, an opening is provided in the wall that partitions the electric blower chamber, and a shielding plate is attached so as to cover the opening. Therefore, the exhaust passage area adjusts the size of the opening and the area where the shielding plate covers the opening. This can be handled easily.
[0012]
【Example】
Example 1
A first embodiment of the present invention will be described below with reference to FIGS. In addition, about the same part as a prior art example, the same code | symbol is attached | subjected and the description is abbreviate | omitted.
[0013]
The support rubber 24 elastically supporting the rear portion of the electric blower 7 is sandwiched from above and below by the main body A21 and the main body B22, and is made of an elastic material such as soft rubber behind the electric blower 7, and is formed in a substantially horseshoe shape. A thin shielding plate 23 is arranged, and this shielding plate 23 is arranged so as to sandwich a support rubber 24 elastically supporting the rear portion of the electric blower 7 as shown in FIG. Reference numeral 25 denotes a holding case that holds a circuit board 26 that controls the operating state of the electric blower 7, and is integrally fixed to the upper surface of the electric blower 7. A support wall A27 of the main body A21 (which constitutes the upper part of the main body 2) holding the support rubber 24 from above is adjacent to the rear portion of the shield plate 23, thereby preventing the positional displacement of the shield plate 23. The support rubber 24 is sandwiched from above and below by a support wall B29 of the main body B22 (which constitutes a lower portion of the main body 2) and a support wall A27 of the main body A21, and is fixed in the main body 2. Reference numeral 28 denotes a substantially cylindrical soundproof plate wrapped around the outer periphery of the electric blower 7 and the holding case 25.
[0014]
A support wall A27 and a support wall B29 are located on the open rear end face side of the soundproof plate 28. The support wall 27, 29 is located behind the electric blower chamber in which the electric blower 7 is arranged, and the exhaust wall An exhaust passage A communicating with the mouth 15 is partitioned. A cutout (opening) is provided in a part of the lower support wall B29 of the main body 2 so that the electric blower chamber and the exhaust passage A partially communicate with each other. In particular, the shape of the cutout of the support wall B29 is not shown, but both lower ends of the horseshoe-shaped shielding plate 23 can be freely moved. That is, notches are provided on the left and right sides of the support rubber 24 so that both lower end portions of the shielding plate 23 can move rearward. The notches formed on the left and right sides of the support rubber 24 allow the electric blower chamber and An opening A30 and an opening B31 that communicate with the exhaust passage A are formed.
[0015]
And since the exhaust discharged by the operation of the electric blower 7 passes through the opening A30 and the opening B31 from the gap between the rear end face side of the soundproof plate 28 and both ends of the shielding plate 23, it goes to the exhaust passage A side. Since the exhaust is not once exhausted to the front as in the prior art, the exhaust in the soundproof plate 28 can be flowed out efficiently. Further, a gap is generated in addition to the rear end face of the soundproof plate 28 and both end portions of the shielding plate 28, and the exhaust of the electric blower 7 exits inside the main body A21 and the main body B22, that is, the electric blower chamber through the gap. Preferably, when a gap is formed between the electric blower 7 and the front end of the soundproof plate 28 and the exhaust of the electric blower 7 exits from the gap into the electric blower chamber, the passage area is expanded. Ventilation resistance can be reduced. Next, the exhaust gas that has not flowed directly from the opening A30 and the opening B31, that is, the exhaust gas that has flowed into the electric blower chamber, is provided with the opening A30 provided on both sides of the support wall B29 of the main body B22 supporting the support rubber 24. After passing through a gap between the opening B31 and the lower end of the shielding plate 23, the air is discharged out of the main body 2 through the exhaust port 15 formed on the rear surface of the main body A21. Since the support wall A27 is located at a position facing the exhaust port 15, the openings A30 and B31 are provided below the support wall A27. Therefore, the exhaust gas passes from the lower side of the electric blower 7 through the lower openings A30 and B31 of the shielding plate 23, and changes the direction upward in the exhaust passage A to become a path discharged from the exhaust port 15.
[0016]
The operation of the above configuration is as follows. That is, when the electric blower 7 is operated strongly, the exhaust gas is discharged from the exhaust port 15 through the lower openings A30 and B31 of the shielding plate 23. At this time, the exhaust air volume and the exhaust air speed are maximum. Both lower ends of the flexible shielding plate 23 formed of an elastic material such as soft rubber are displaced rearward as shown in FIG. For this reason, a sufficient exhaust passage area can be secured, and a predetermined maximum suction force can be obtained. Even in this state, since the openings A30 and B31 are not directly opposed to the exhaust port 15, the high-frequency sound generated by the electric blower 7 propagated by the exhaust is bypassed at the same time as being shielded by the shielding plate 23. The sound is attenuated and discharged in the course of the exhaust path, and the driving noise is reduced.
[0017]
Further, when the electric blower 7 is operated weakly, the exhaust air volume and the exhaust air speed of the exhaust gas passing through the openings A30 and B31 are minimum, so that both lower ends of the flexible shielding plate 23 are slightly displaced. Only. For this reason, the high-frequency sound propagated by the exhaust is maximally sound-insulated by the shielding plate 23, and at the same time, is attenuated and exhausted along the detoured exhaust path, so that the operation sound can be greatly reduced. .
[0018]
In addition, as described above, the openings A30 and B31 change the passage area by the shielding of the shielding plate 23 whose lower end is displaced according to the strong to weak operation mode switched by the control switch 13 of the electric blower 7, respectively. The suction force and operation sound desirable for the operation mode can be obtained.
[0019]
Further, the exhaust passage area is the size of the notch provided in the support wall B29, that is, the exhaust passage area of the openings A30 and B31 and the size of the shielding plate 23 covering a part of the openings A30 and B31. Therefore, a sufficient exhaust passage area can be ensured without increasing the size of the main body 2 or the soundproof plate 28, and downsizing of the main body 2 can be promoted.
[0020]
Next, since the shielding plate 23 is made of an elastic material such as soft rubber, it maintains sufficient durability against displacement of both lower ends according to changes in the exhaust air volume and the exhaust air speed, and is made of a general resin. Since the specific gravity is large, a high sound insulation effect can be obtained even with the same thickness.
[0021]
Further, since the openings A30 and B31 shielded by the shielding plate 23 do not directly face the exhaust port 15, the high frequency sound generated by the electric blower 7 propagated by the exhaust is simultaneously shielded by the shielding plate 23, In the exhaust path detoured by the shielding plate 23, the exhaust sound is greatly attenuated and discharged, and the driving noise is further reduced.
[0022]
Moreover, since the shielding plate 23 is thin, it can be easily formed by a punching process called a Thomson mold and can be manufactured at a low cost.
[0023]
(Example 2)
Next, a second embodiment of the present invention will be described with reference to FIG. The same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.
[0024]
The shielding plate 23 is formed by integrating a shielding plate A32 made of a rubber-based material and a wool felt shielding plate B33 disposed on the electric blower 7 side.
[0025]
With the above configuration, when exhaust flows through the portions that shield the openings A30 and B31 due to the exhaust of the electric blower 7, the portions are sound-insulated while being displaced rearward according to the exhaust wind speed, and at the same time, a shield plate made of wool felt B33 absorbs sound centering on high-frequency sound in the exhaust gas, and driving noise is greatly reduced.
[0026]
In the above description, the openings A30 and B31 are provided on the main body B22 side. However, the openings A30 and B31 may be provided on the main body A21 side, and the exhaust port 15 may be similarly formed on the main body B22. It is only necessary that they are not opposed to each other and the shielding plate 23 shields the openings A30 and B31 so as to be displaceable.
[0027]
The shielding plate 23 is made of an elastic material such as soft rubber, but may be formed of a material having similar characteristics such as an elastomer.
[0028]
【The invention's effect】
According to the first aspect of the present invention, since the opening is provided in the wall that partitions the electric blower chamber and the shielding plate is attached so as to cover the opening, the exhaust passage area is the size of the opening, By adjusting the area where the shielding plate covers the opening, it can be easily handled, and it is only necessary to change the size of the opening in the wall. Loss of suction force during operation can be prevented.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a vacuum cleaner according to a first embodiment of the present invention. FIG. 2 is a plan view when the main body A is removed. FIG. FIG. 4 is a cross-sectional view of the electric blower. FIG. 5 is a cross-sectional view of the electric blower during strong operation. FIG. 6 is a cross-sectional view of the electric blower according to the second embodiment of the invention. FIG. 7 is a perspective view of a conventional vacuum cleaner. FIG. 8 is a horizontal sectional view of the main body of the vacuum cleaner. FIG. 9 is a perspective view of the motor cover as viewed from below.
7 Electric blower 15 Exhaust port 21 Body A
22 Body B
23 Shielding plate 30 Opening A
31 Opening B

Claims (1)

An electric blower for sucking dust, a main body having an electric blower chamber containing the electric blower, an exhaust port provided on the rear surface of the main body , and an exhaust passage for leading exhaust from the electric blower chamber to the exhaust port And a wall partitioning the electric blower chamber and the exhaust passage, and the wall is provided with an opening at a position where the upper portion faces the exhaust port and the lower portion does not face the exhaust port. covered with a shielding plate made of parts of the flexible material, wherein that the lower end portion that is not fixed in the shield plate by the exhaust from the electric blower is moved, so that can be secured in the exhaust passage area corresponding to the air volume of the exhaust A vacuum cleaner.

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